001// Copyright 2007-2013 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.services; 016 017import org.apache.tapestry5.MarkupWriter; 018 019/** 020 * Filter interface for {@link org.apache.tapestry5.services.MarkupRenderer}, which allows for code to execute before 021 * and/or after the main rendering process. Typically, this is to allow for the placement of 022 * {@linkplain org.apache.tapestry5.services.Environment environmental services}. 023 * 024 * @see org.apache.tapestry5.modules.TapestryModule#contributeMarkupRenderer 025 */ 026public interface MarkupRendererFilter 027{ 028 /** 029 * Implementations should perform work before or after passing the writer to the renderer. 030 * 031 * @param writer 032 * to which markup should be written 033 * @param renderer 034 * delegate to which the writer should be passed. 035 */ 036 void renderMarkup(MarkupWriter writer, MarkupRenderer renderer); 037}